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High density clear brine fluids

a high-density, brine technology, applied in the direction of drilling composition, chemistry apparatus and processes, etc., can solve the problems of high cost, limited density of brine, environmental and economic limitations of zinc based fluids, etc., and achieve excellent results

Inactive Publication Date: 2018-01-18
LANXESS SOLUTIONS US INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes the discovery of certain organic compounds that can be added to clear brine fluids to make them more effective in preventing salt precipitation and maintaining a high concentration of dissolved salt. This results in new, high density, zinc-free, clear brine fluids with low crystallization temperatures and good environmental compatibility. The crystallization suppressant mentioned in the text can include certain sugars and 1,3-dicarbonyl compounds, as well as other substances like a C4-6 alditol or a C3-7 malonamide.

Problems solved by technology

The amount of a particular salt in a brine fluid, and thus the density of the brine, is limited by the solubility of that salt in water.
However, zinc based fluids have environmental and economic limitations.
Zinc is regulated and not environmentally friendly and requires a zero-discharge system when in use.
Zinc contaminated flow-back and well-produced water has to be collected and shipped to shore for disposal or treatment and cannot, e.g., be pumped off-rig into the Gulf of Mexico.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0031]Aqueous calcium bromide samples comprising 53 to 65 wt % calcium bromide solution and 2 to 20 wt % were prepared by adding the crystallization suppressant, i.e., D-sorbitol, malonamide or xylitol, to an aqueous solution of calcium bromide. Generally, some heating is required prior to addition of crystallization suppressant to create a clear CaBr2 solution at higher assays.

[0032]In the following examples, true crystallization temperature was established according to API Protocol 13J 5th Edition, October 2014 “Testing of Heavy Brines”. Clear brine fluid density of test samples was determined at 60° F. using an Anton PAAR Density Meter set at 60° F. and the results compared to the solution without suppressant. Density of the CaBr2 solution without suppressant is determined at 100° F. due to the higher TCT of the suppressant free fluids.

[0033]In the examples, the assay and density of the starting CBF is lowered due to the mass amount of the crystallization suppressant added, howev...

examples 1-3

s Crystallization Suppressant

[0034]Ex. 1—D-Sorbitol was added in progressively larger amounts to a 61.5% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.[0035]Ex 2.—D-Sorbitol was added in progressively larger amounts to a 62% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.[0036]Ex. 3—D-Sorbitol was added in progressively larger amounts to a 64% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.

[0037]Results for examples 1-3 are shown in the table below:

Sorbitol as Crystallization Suppressant

[0038]

wt % wt % Density Density CaBr2 D-sorbitolTCT@ 60° F.@ 100° F.61.5%0   86.3° F.—15.6 ppg61.5%12.5%    8.6° F.15.01 ppg—  62%0   88.9° F.—15.7 ppg  62%13.6% 15.10 ppg—  64%0   93.2° F.—16.2 ppg  64%  15%   19.9° F.15.47 ppg—

examples 4-6

s Crystallization Suppressant

[0039]Ex. 4—Malonamide was added in progressively larger amounts to a 61.5% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.[0040]Ex. 5—Malonamide was added in progressively larger amounts to a 63% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.[0041]Ex. 6—Malonamide was added in progressively larger amounts to a 63.5% CaBr2 aqueous solution and the TCT and density at 60° F. was determined.

[0042]Results are shown in the following table:

Malonamide as Crystallization Suppressant

[0043]

wt % wt % Density Density CaBr2 MalonamideTCT@ 60° F.@ 100° F.61.5086.3°F.— 15.6 ppg61.513.5% 5.5°F.14.89 ppg—  63%091.° 4 F.—15.89 ppg  63%14.0% 1.4°F.14.94 ppg—63.5%0  92°F.—16.04 ppg63.5%15.1% 4.0°F.15.06 ppg—

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PUM

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Abstract

Compounds are identified that act as crystallization suppressants when added to clear brine fluids, significantly lowering the true crystallization temperatures of the brines, and allowing for higher salt content in clear brine fluids. The crystallization suppressants of the invention also allow for the preparation of higher density zinc free brines.

Description

[0001]The addition of particular crystallization suppressants to high density clear brine fluids significantly lower the true crystallization temperatures of the fluids allowing for higher salt content in the fluids and for the preparation of, e.g., higher density zinc free brines.BACKGROUND OF THE INVENTION[0002]Clear brine fluids are solids-free, industrial fluids widely used in operations where control of pressure in a well is needed, such as in the oil and gas industry, and play an important role in oil exploration and development of deep water wells, high-pressure and deep oil wells, oil sands, and the like. Clear brine fluids find use in well completion, work-over, drilling and fracturing operations, and serve a variety of functions such as a displacement fluid to remove drilling muds, as drill-in fluids, as permanent packer fluid. They inhibit undesirable formation reactions such as clay swelling and are used in preparing well equipment for production, e.g., during insertion ...

Claims

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Application Information

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IPC IPC(8): C09K8/08C09K8/03
CPCC09K8/03C09K8/08C09K8/04C09K8/40C09K8/68C09K8/86C09K8/88C09K2208/12
Inventor RAY, THOMAS G.KEENE, COLIN H.SIKORA, DAVID J.BARTLEY, DAVID W.WARNER, JOHNWHITFIELD, JUSTINTSHUDY, DWIGHTWILLIAMS, JONI P.
Owner LANXESS SOLUTIONS US INC
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